Probability
posted by Morgan .
According to the record of the registrar's office at a state university, 40% of the students are freshman, 25% are sophomore, 20% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion of students who live in the dormitory are, respectively, 75%, 60%, 40%, and 30%.
If a randomly selected student does not live in the dormitory, what is the probability that the student is a junior?
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